Femtosecond Photo-Induced Phenomena in Multiferroic Hexagonal Manganite YMnO₃

Abstract:

Transient optical anisotropy in the hexagonal manganite YMnO₃ excited by linearly and circularly polarized laser pulses has been observed. The photo-induced anisotropy was investigated by the pump-probe technique based on a femtosecond Ti:sapphire laser generating optical pulses at the photon energy of 1.55 eV. Temporal and spectral dependencies of the photo-induced optical rotation and ellipticity were analyzed by a theoretical model considering ultrafast population and relaxation processes near the interband transitions from the hybridized O²⁻(2p)-Mn³⁺(3d) (Γ₁) to the Mn³⁺(3d³_z2−r2) (Γ₅) states at photon energies of the laser excitation. Very short relaxation time of ~10 fs, which is the Raman coherence time between the excited Γ₅|x> and Γ₅|y> states, has been determined. It is found that this coherence time is much shorter than a charge relaxation time of ~500 fs between the Γ₅|x,y> and Γ₁|g> states for the interband electronic transition Γ₁→Γ₅.

• Periodical: Solid State Phenomena (Volumes 233-234)
• Pages: 149-152
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.233-234.149
• Online since: July 2015
• Authors: Victor Pavlov*, Valerii Gridnev, Roman Pisarev, Martin Pohl, Ilya Akimov, Dmitri Yakovlev, Manfred Bayer
• Keywords: Femtosecond Pump-Probe Technique, Magneto-Optical Anisotropy, Multiferroic Hexagonal Manganites, Optical Alignment and Orientation, Photo-Induced Optical Anisotropy

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